1 / 18

Radio-Frequency (RF) & Schottky diagnostics WP for ELENA

Maria Elena Angoletta, BE/RF on behalf of the CERN RF group. Radio-Frequency (RF) & Schottky diagnostics WP for ELENA. First ELENA construction meeting CERN, 28-29 September 2011. Outline. What How Possible external contributions Conclusions References. 1. What: RF.

natan
Download Presentation

Radio-Frequency (RF) & Schottky diagnostics WP for ELENA

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Maria Elena Angoletta, BE/RF on behalf of the CERN RF group Radio-Frequency (RF) & Schottky diagnostics WP for ELENA First ELENA construction meeting CERN, 28-29 September 2011

  2. Outline • What • How • Possible external contributions • Conclusions • References M. E. Angoletta, 28 Sept 2011 “RF & Schottky WP for ELENA” First ELENA construction meeting

  3. 1. What: RF Actions: beam capture, deceleration & synchronisation (inj + extr). Qualitative ELENA cycle & RF actions. Components: • Schottky Longitudinal Pick-ups (LPUs) : based on AD LPUs design • Cavity • Low-level RF (LLRF) From CERN injectors’ RF consolidation M. E. Angoletta, 28 Sept 2011 “RF & Schottky WP for ELENA” First ELENA construction meeting 1

  4. 1. What: Schottky diagnostics Actions: beam parameters calculation on whole ELENA cycle • Debunched beam:Schottky scans (Np, p/p, <p>, averaged spectra) • Bunched beam: Np + bunch length from RF currents Main components: • Signal detection: Schottky LPUs (same as for RF part) • Real-time digital signal processing: LLRF hardware • Based on AD Schottky diagnostics • Essential machine diagnostics, used for >10 year • Usage: machine/cooling monitoring, optimisation, debugging • Included in RF WP as closely interlinked to LLRF M. E. Angoletta, 28 Sept 2011 “RF & Schottky WP for ELENA” First ELENA construction meeting 2

  5. Outline • What • How • Possible external contributions • Conclusions • References M. E. Angoletta, 28 Sept 2011 “RF & Schottky WP for ELENA” First ELENA construction meeting

  6. 2. How: overview Controls OASIS Ring Schottky diagnostics Tomoscope LLRF interface Reference editor Working Set Local CR LLRF & diagnostic data processING BTrain, injection/extraction references, timings beam Cavity LPUs M. E. Angoletta, 28 Sept 2011 “RF & Schottky WP for ELENA” First ELENA construction meeting 3

  7. 2. How: Cavity • Low-voltage broadband cavity + ampli • BW: 145 kHz → 1.06 MHz • Controlled voltage range: 0.7 mV → 11 V • NB: > 80 dB dynamic range, challenging for LLRF !!! • Material: ferrite vs. magnetic-alloy (Finemet) • Finemet is the likely choice • Important item in injectors HLRF renovation • Finemet (FT3M) cavity deployed in CERN’s LEIR [1]. • Low-loss Finemet (FT3L) [2] cavity will be tested in CERN’s PSB. • Collaboration with MedAustron on HLRF. Finemet ring (courtesy G. Kotzian, MedAustron). M. E. Angoletta, 28 Sept 2011 “RF & Schottky WP for ELENA” First ELENA construction meeting 4

  8. 2. How: overview Controls OASIS Ring Schottky diagnostics Tomoscope LLRF interface Reference editor Working Set Local CR LLRF & diagnostic data processING BTrain, injection/extraction references, timings beam Cavity LPUs M. E. Angoletta, 28 Sept 2011 “RF & Schottky WP for ELENA” First ELENA construction meeting

  9. 2. How: Longitudinal Pick-Up (LPU) • Usage: • Non-trivial development based on AD LPU [3] • Beam phase loop in LLRF • Longitudinal Schottky scans (if noise low enough) • BW : 20 kHz → 20 MHz. • 2 separate LPUs (HF + LF) + head amplifier • Summing unit in local CR • Space limitations + components obsolescence • → re-design likely needed. LPU (LF + HF) currently installed in the AD M. E. Angoletta, 28 Sept 2011 “RF & Schottky WP for ELENA” First ELENA construction meeting 5

  10. 2. How: overview Controls OASIS Ring Schottky diagnostics Tomoscope LLRF interface Reference editor Working Set Local CR LLRF & diagnostic data processING BTrain, injection/extraction references, timings beam Cavity LPUs M. E. Angoletta, 28 Sept 2011 “RF & Schottky WP for ELENA” First ELENA construction meeting

  11. 2. How: LLRF & Schottky diagnostics • State-of-the-art digital h/w + signal processing • CERN RF new standard for Meyrin injectors • Evolution of CERN’s LEIR system [4] • Backplane: VME Switched Serial (VXS) • Motherboard: 2 x Virtex5 FPGAs + SharcDSP 400MHz • Daughtercards: FPGA Mezzanine Card Standard (FMC) Some schematics & pictures of new h/w • H/w + part of code (DSP, FPGA) from RF injectors consolidation [5]. • Diagnostics: precise data processing specs from AD experience [6]. M. E. Angoletta, 28 Sept 2011 “RF & Schottky WP for ELENA” First ELENA construction meeting 6

  12. 2. How: LLRF & Schottky diagnostics OPTIONAL Block diagram of the ELENA RF & Schottky diagnostics system. M. E. Angoletta, 28 Sept 2011 “RF & Schottky WP for ELENA” First ELENA construction meeting 7

  13. Outline • What • How • Possible external contributions • Conclusions • References M. E. Angoletta, 28 Sept 2011 “RF & Schottky WP for ELENA” First ELENA construction meeting

  14. 3. Possible external contributions 1. Cavity • No outsourcing required 2. Schottky Longitudinal PU • Estimates are for copy of existing AD Schottky LPU. • Re-design likely needed. • Possible external help (@CERN!)?? M. E. Angoletta, 28 Sept 2011 “RF & Schottky WP for ELENA” First ELENA construction meeting 8

  15. 3. Possible external contributions – cont’d 3. LLRF • Possible outsourcing @CERN & in collaboration with BE/RF. M. E. Angoletta, 28 Sept 2011 “RF & Schottky WP for ELENA” First ELENA construction meeting 9

  16. 3. Possible external contributions – cont’d 4. Digital signal processing • DSP + FPGA development (~0.5 FTE): possible outsourcing @CERN & in collaboration with BE/RF. • Diagnostic-specific application (~0.3 FTE): possible outsourcing @CERN & in collaboration with BE/RF. M. E. Angoletta, 28 Sept 2011 “RF & Schottky WP for ELENA” First ELENA construction meeting 10

  17. 4. Conclusions • ELENA project will profit from RF injectors consolidation (HLRF + LLRF). • AD experience: • Invaluable starting point for new developments • Enables precise specs for digital signal processing • Tight manpower: • External collaborations welcome! • Identified areas for possible external contributions. … Now the ball is in your court… M. E. Angoletta, 28 Sept 2011 “RF & Schottky WP for ELENA” First ELENA construction meeting 11

  18. 5. References [1] R. Garoby, M. Haase, P. Maesen, M. Paoluzzi, C. Rossi, C. Ohmori (KEK), “The LEIR RF System”, PAC05, Knoxville, USA, May 2005. C. Ohmori et al., “Developments of Magnetic Alloy Cores with Higher Impedance for J-PARC Upgrade”, IPAC01, Kyoto, 2010. C. Gonzales, F. Pedersen, “An ultra low-noise AC beam transformer for deceleration and diagnostics of low intensity beams”, PAC ’99, NY, 1999. M. E. Angoletta, J. Bento, A. Blas, E. Bracke, A. Butterworth, F. Dubouchet, A. Findlay. F. Pedersen, J. Sanchez-Quesada, “CERN’S LEIR Digital LLRF: System Overview and Operational Experience”, IPAC 2010, Kyoto, 2010. M. E. Angoletta, A. Blas, A. Butterworth, A. Findlay, P. M. Leinonen, J. C. Molendijk, F. Pedersen, J. Sanchez-Quesada, M. Schokker, “CERN’s PS Booster LLRF Renovation: Plans and Initial Beam Tests”, IPAC 2010, Kyoto, 2010. M. E. Angoletta, V. Chohan, M. Ludwig, O. Marqversen, F. Pedersen, “The New Digital-Receiver-Based System for Antiproton Beam Diagnostics”, PAC 2001, New York, 2001. [2] [3] [4] [5] [6] M. E. Angoletta, 28 Sept 2011 “RF & Schottky WP for ELENA” First ELENA construction meeting 12

More Related